They are the first line of defense in airport security but two troubling incidents involving TSA agents at LAX are raising concerns.

A TSA agent was arrested on January 3rd in Terminal One at LAX, a source told NBCLA. He had just gotten off duty and was behaving erratically, saying, “I am god, I’m in charge.” The agent was arrested.

Meanwhile, a TSA Internal Affairs investigation turned up evidence of LAX TSA agents using drugs at an after-hours party.

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TSA officials say a videotape of the party was of poor quality and the employees were not in uniform, but 4 employees were tentatively identified.

All 4 were tested for drugs. One came back positive and that employee was fired.